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I am fairly certain sum=1/(1-x) holds true only for x<1. when x>1, it is a divergent series... and I can't tell if you're joking or not, or I would just laugh..

I am fairly certain sum=1/(1-x) holds true only for x<1. when x>1, it is a divergent series... and I can't tell if you're joking or not, or I would just laugh...